Xuesen Qian or Hsuehsen Chien or Hsueshen Tsien, Chinese engineer and physicist (Hangzhou, Zhejiang Province 11 December 1911 Beijing 31 October 2009) His relative is Nobel Prize winner Roger Yonchien Tsien Recognized as one of the world’s leading aerodynamicists ACHIEVEMENTS A method for predicting the compressibility burble With M.C. Chang. A similarity law for stressing rapidly heated thinwalled cylinders A method for comparing the performance of power plants for vertical flight Developed a method for two dimensional subsonic compressible flow and a procedure which enables the prediction of the compressibility burble from test data obtained at low air speeds With T. Von Karman gave a general relation between drag and heat transfer as function of Mach’s number Developed a general method using stepwise doublet distribution for a pointed projectile With E.J. Malina presented an exact solution of the problem of determining the height reached by a body in vertical flight in vacuo propelled by successive impulses Developed a new principle involving the energy level and the geometric restraint to determine buckling of thin shells in equilibrium states Gave a generalization of Blasius theorem for calculating aerodynamic forces acting on an airfoil With E. Reissner & C.C. Lin presented a simple unified treatment of the unsteady twodimensional polytropic potential flow around a slender body Formulated rules for achieving complete flow similarity of rarified gas flow Generalized Alfrey theorem for isotropic compressible media involving body forces With T.C. Adamson & E.L. Knuth suggested a scheme of tracking and automatic navigation involving a highspeed computer and elevator servo for a long range rocket vehicle Coauthored the article Comment and initial analysis of longrange rocket, which laid a foundation for groundtoground missiles and sounding rocket theoryPut forward a new methodology of systems engineering, the metasynthetic engineering With J.Y. Yu & R.W. Dai. A new discipline of science. The study of open complex giant system and its methodology (1988) EPONYMY KarmanQian formula KarmanTsien method KarmanTsien law KarmanTsien correction factor HONOURS Qianxuesen 3763 (asteroid)

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